"The Darkening, Part 1 of 4: An Unholy Pact"*Certain that the Mento Helmet's powers can restore Cyborg's mind, the Changeling steals the device and delivers it to the Brotherhood of Evil. They have promised to cure Vic... for a price. Meanwhile, Nightwing's control of the Titans begins to slip when Speedy returns.* Source DCGuide.com